Abstract
AbstractThe forces acting on dislocations situated near a free, welded, and slipping boundary are examined as a function of elastic anisotropy and misorientation across the boundary. The anisotropic theory of elasticity is used. The dislocations are attracted to a free surface by a force equivalent to that due to a dislocation of opposite sign at the image point. The same force acts on dislocations near a slipping boundary for the particular case where the Burgers vector is parallel to the slipping boundary. For a welded boundary the force on a screw dislocation depends only on the crystallographic direction of the dislocation and on the direction in the second grain parallel to this. For an edge or mixed dislocation near a welded boundary as well as for a dislocation near a slipping boundary with a component of the Burgers vector normal to the boundary the complete orientation of both grains must be specified. Numerical results for several b.c.c. materials are given.
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